Implement smarter axiom link strategy, selecting the axiom which has the least possible partner (similar to the Grail 3 strategy and to Knuth's general Dancing Links algorithm).
Merged first version of dancing links into master branch. Some more improvements and testing are surely necessary, but for now this issue can be closed.
Implement smarter axiom link strategy, selecting the axiom which has the least possible partner (similar to the Grail 3 strategy and to Knuth's general Dancing Links algorithm).